within line of sight, technologically almost unlimited, autonomous any where. >> we can click on a map and say go here, and it will go there and hoover. and i can say, look at this point and it will look at that point and hoover. >> reporter: some are concerned about the issue of privacy and security. >> if i'm sitting in my backyard enjoying a naked sunbathing afternoon. if a tiny little drone flies over i don't know that i shouldn't be doing something to protect my privacy. >> reporter: the aclu refuses the use of drones in alameda county and elsewhere, it's taken no position yet on private drones. with stronger memories and bigger batteries drones can pick up more. this one is fake for a video game but a drone with a gun is possible. >> if i were still active and i saw one of those doing something like that i would shoot it down. you know pure and simple. destroy it. >> reporter: former alameda sheriff charles plumber says it's an faa problem. law enforcement and the faa are already concerned about drones in the national air space. we obtained this video of a drone buzzing the golde